The gtk2 package contains the GIMP ToolKit (GTK+), a library for creating graphical user interfaces for the X Window System.
During testing of a previously fixed flaw in Qt (CAN-2004-0691), a flaw was discovered in the BMP image processor of gtk2. An attacker could create a carefully crafted BMP file which would cause an application to enter an infinite loop and not respond to user input when the file was opened by a victim. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0753 to this issue.
During a security audit Chris Evans discovered a stack and a heap overflow in the XPM image decoder. An attacker could create a carefully crafted XPM file which could cause an application linked with gtk2 to crash or possibly execute arbitrary code when the file was opened by a victim. (CAN-2004-0782, CAN-2004-0783)
Chris Evans also discovered an integer overflow in the ICO image decoder. An attacker could create a carefully crafted ICO file which could cause an application linked with gtk2 to crash when the file was opened by a victim. (CAN-2004-0788)
This updated gtk2 package also fixes a few key combination bugs on various X servers, such as Hummingbird, ReflectionX, and X-Win32. If a server was configured to use the Swiss German, Swiss French, or France French keyboard layouts, Mode_Switched characters were unable to be entered within GTK based applications.
Users of gtk2 are advised to upgrade to these packages which contain backported patches and are not vulnerable to these issues.